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L6566ATR データシート(PDF) 37 Page - STMicroelectronics

部品番号 L6566ATR
部品情報  Multi-mode controller for SMPS with PFC front-end
PDF  51 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6566ATR データシート(HTML) 37 Page - STMicroelectronics

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L6566A
Application information
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Figure 22 on page 35
shows the internal block diagram, while the timing diagrams in
Figure 23 on page 36
illustrate the operation.
Note:
To use the OVP function effectively, i.e. to ensure that the OVP comparator will be always
interrogated during MOSFET’s OFF-time, the duty cycle D under open-loop conditions must
fulfill the following inequality:
Equation 12
where TBLANK2 = 2 µs; this is also illustrated in the diagram of Figure 24.
Figure 24. Maximum allowed duty cycle vs. switching frequency for correct OVP
detection
1
f
T
D
sw
2
BLANK
≤
+
5 .10
4
1 .10
5
1.5.10
5
2 .10
5
2.5 .10
5
3 .10
5
3.5 .10
5
4 .10
5
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.725
fsw [Hz]
Dmax



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